To find and replace text in multiple files, you can use the FAR or Find And Replace app on your computer. It is freeware and works with almost any file extension, including TXT, PHP, CSS, JS, HTML ...

This is how you can find and replace Text in Notepad on Windows 11/10. You can even replace multiple texts at once in Notepad by following this trick.

Enumerating files in a folder Opening files for reading and writing How to strip the first four characters from a string I'm not at a Windows PC right now so I can't test anything myself just yet ...

Microsoft Word's Replace feature is under-used because the more complex the requirement, the more complex the solution. If you're inserting characters into the middle of a string, there is a solution.